I have the maintenance manual for my sled which is a 2011 ski doo 600 carb tnt and I wanted to replace the pads and remove the disc rotor to clean it. However, in the caliper removal section it tells me I need to access through the chain case to even get the rotor off. Is this the case or can I just pull the circlip that appears to be holding the rotor on and pull it off the shaft that way? Isn't this the only thing holding the rotor on? The caliper is fine and I do not need to change that. Thanks.